EP0907445B1 - Bohrer - Google Patents

Bohrer Download PDF

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Publication number
EP0907445B1
EP0907445B1 EP97922251A EP97922251A EP0907445B1 EP 0907445 B1 EP0907445 B1 EP 0907445B1 EP 97922251 A EP97922251 A EP 97922251A EP 97922251 A EP97922251 A EP 97922251A EP 0907445 B1 EP0907445 B1 EP 0907445B1
Authority
EP
European Patent Office
Prior art keywords
plane
shank
drill
cutting
flutes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97922251A
Other languages
English (en)
French (fr)
Other versions
EP0907445A1 (de
Inventor
Stefan Lindblom
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sandvik AB
Original Assignee
Sandvik AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from SE9601674A external-priority patent/SE507827C2/sv
Application filed by Sandvik AB filed Critical Sandvik AB
Publication of EP0907445A1 publication Critical patent/EP0907445A1/de
Application granted granted Critical
Publication of EP0907445B1 publication Critical patent/EP0907445B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Definitions

  • the drill disclosed in figures 2-4 has been designed in such a way that the secondary plane D-D of the centre cutting edge 12, 12' is oriented essentially at an angle of 90° to the land plane or the main rigidity direction F-F at the base end 7 of the shank.
  • these two cutting inserts 5, 5' are indicated by dotted lines and from this figure it is learnt how the plane D-D substantially coincides with the duct plane E-E at the base end, i.e. in the cross-section B-B.
  • the land plane F-F in which the shank has its highest bending rigidity in the area of the base end is oriented perpendiculary to the centre cutting edge 12, 12'.

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  • Drilling Tools (AREA)

Claims (1)

  1. Bohrer mit einem Schaft (1) mit einem vorderen, eine Spitze bildendenden Ende (2) mit zwei in einer gemeinsamen Hauptebene (C-C) angeordneten Schneideinsätzen oder Schneideinssatz ähnlichen Teilen (5, 5') mit Schneidkanten (10, 10') parallel zu der Hauptebene, wobei die Schneidkanten an entgegengesetzten Enden in kürzere, zentrale Schneidkanten (12, 12') wechseln, die in einer im wesentlichen gemeinsamen zweiten Ebene (D-D) ausgerichtet sind, welche sich unter einem spitzen Winkel relativ zu der Hauptebene erstreckt, wobei die Schneidkanten (12, 12') zusammen eine spitz zulaufende Zentrumsschneidkante bilden zwecks Eintretens in ein Werkstück, wodurch der Bohrer an einem gewünschten Punkt relativ zu dem Werkstück zentriert wird, wobei der Schaft (2) mindestens teilweise spiralförmige Spannuten (6, 6') hat, die sich von dem spitzen Ende (2) zu einem Basisende (7) in Verbindung mit einem rückwärtigen Halteteil (3) des Schaftes erstrecken, wobei die Spannuten in jedem willkürlichen Querschnitt längs des Schaftes diametral gegenüber einander in einer Ebene (E-E) angeordnet sind, die sich unter einem Winkel von 90° zu einer Ebene (F-F) erstreckt, die zwei Fasen (8, 8') auf beiden Seiten der Spannuten (6, 6') gemeinsam ist, wobei der Schaft maximale Biegesteifigkeit in dieser Ebene (F-F) hat, dadurch gekennzeichnet, daß die zweite Ebene (D-D) für die Zentrumsschneidkante (12, 12') unter einem Winkel relativ zu der Fasenebene oder Hauptsteifigkeitsrichtung (F-F) an dem Basisende (7) des Schaftes ausgerichtet ist und der Winkel 80-100° ist, zweckmäßigerweise 85-95° ist und vorzugsweise 90° beträgt.
EP97922251A 1996-05-02 1997-04-29 Bohrer Expired - Lifetime EP0907445B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9601674 1996-05-02
SE9601674A SE507827C2 (sv) 1996-05-02 1996-05-02 Borr
PCT/SE1997/000716 WO1997040953A1 (en) 1996-05-02 1997-04-29 Drill

Publications (2)

Publication Number Publication Date
EP0907445A1 EP0907445A1 (de) 1999-04-14
EP0907445B1 true EP0907445B1 (de) 2001-12-19

Family

ID=20402427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97922251A Expired - Lifetime EP0907445B1 (de) 1996-05-02 1997-04-29 Bohrer

Country Status (4)

Country Link
EP (1) EP0907445B1 (de)
JP (1) JP2000508976A (de)
CN (1) CN1087987C (de)
DE (1) DE69709351T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10337203A1 (de) * 2003-08-13 2005-03-31 Kennametal Inc. Bohrwerkzeug
DE10353514A1 (de) * 2003-11-14 2005-06-23 Heule, Ulf Bohrplatte mit klemmender Befestigung in einem Grundkörper
US8882412B2 (en) * 2011-05-11 2014-11-11 Kennametal Inc. Rotary cutting tool having PCD cutting tip
JP5816364B2 (ja) 2012-05-30 2015-11-18 オーエスジー株式会社 ３枚刃ドリル
KR102434577B1 (ko) * 2015-05-08 2022-08-19 대구텍 유한책임회사 절삭 공구
CN107542406A (zh) * 2016-06-27 2018-01-05 林惠花 一种石墨烯钻头
CN107442816A (zh) * 2017-09-07 2017-12-08 深圳市鑫国钰精密工具有限公司 钻头

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4222690A (en) * 1977-12-03 1980-09-16 Ryosuke Hosoi Drill having cutting edges with the greatest curvature at the central portion thereof
DE3131794C2 (de) * 1980-08-29 1986-08-07 Toshiaki Osaka Hosoi Bohrer
JPS6025608A (ja) * 1983-07-19 1985-02-08 Masao Kubota ツイストドリル
SE501515C2 (sv) * 1993-03-03 1995-03-06 Sandvik Ab Spiralborr med förbättrad böjstyvhet

Also Published As

Publication number Publication date
JP2000508976A (ja) 2000-07-18
CN1216944A (zh) 1999-05-19
DE69709351D1 (de) 2002-01-31
CN1087987C (zh) 2002-07-24
EP0907445A1 (de) 1999-04-14
DE69709351T2 (de) 2002-08-14

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